<?php if (!empty($tweet_viewers)) { ?>
  <?php foreach ($tweet_viewers as $viewer) { ?>
    <a id="tweet_viewer_<?php echo $viewer['user_id']; ?>" href="<?php echo base_url('profile/' . $viewer['user_name']); ?>">
      <img title="<?php echo '@' . $viewer['user_name']; ?>" class="thumbnail pull-left" style="max-width: 32px; max-height: 32px; margin: 4px;" src="<?php echo base_url('assets/photos/' . $viewer['user_image']); ?>"/>
    </a>
  <?php } ?>
<?php } ?>